src/keyboard.h

   1 /* Declarations useful when processing input.
   2    Copyright (C) 1985-1987, 1993, 2001-2015 Free Software Foundation,
   3    Inc.
   4
   5 This file is part of GNU Emacs.
   6
   7 GNU Emacs is free software: you can redistribute it and/or modify
   8 it under the terms of the GNU General Public License as published by
   9 the Free Software Foundation, either version 3 of the License, or
  10 (at your option) any later version.
  11
  12 GNU Emacs is distributed in the hope that it will be useful,
  13 but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 GNU General Public License for more details.
  16
  17 You should have received a copy of the GNU General Public License
  18 along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.  */
  19
  20 #include "systime.h"            /* for struct timespec, Time */
  21 #include "coding.h"             /* for ENCODE_UTF_8 and ENCODE_SYSTEM */
  22 #include "termhooks.h"
  23
  24 INLINE_HEADER_BEGIN
  25
  26 /* Most code should use this macro to access Lisp fields in struct kboard.  */
  27
  28 #define KVAR(kboard, field) ((kboard)->INTERNAL_FIELD (field))
  29
  30 /* Each KBOARD represents one logical input stream from which Emacs
  31    gets input.  If we are using ordinary terminals, it has one KBOARD
  32    object for each terminal device.
  33    Usually each X display screen has its own KBOARD,
  34    but when two of them are on the same X server,
  35    we assume they share a keyboard and give them one KBOARD in common.
  36
  37    Some Lisp variables are per-kboard; they are stored in the KBOARD structure
  38    and accessed indirectly via a Lisp_Misc_Kboard_Objfwd object.
  39
  40    So that definition of keyboard macros, and reading of prefix arguments,
  41    can happen in parallel on various KBOARDs at once,
  42    the state information for those activities is stored in the KBOARD.
  43
  44    Emacs has two states for reading input:
  45
  46    ** Any kboard.  Emacs can accept input from any KBOARD,
  47    and as soon as any of them provides a complete command, Emacs can run it.
  48
  49    ** Single kboard.  Then Emacs is running a command for one KBOARD
  50    and can only read input from that KBOARD.
  51
  52    All input, from all KBOARDs, goes together in a single event queue
  53    at interrupt level.  read_char sees the events sequentially,
  54    but deals with them in accord with the current input state.
  55
  56    In the any-kboard state, read_key_sequence processes input from any KBOARD
  57    immediately.  When a new event comes in from a particular KBOARD,
  58    read_key_sequence switches to that KBOARD.  As a result,
  59    as soon as a complete key arrives from some KBOARD or other,
  60    Emacs starts executing that key's binding.  It switches to the
  61    single-kboard state for the execution of that command,
  62    so that that command can get input only from its own KBOARD.
  63
  64    While in the single-kboard state, read_char can consider input only
  65    from the current KBOARD.  If events come from other KBOARDs, they
  66    are put aside for later in the KBOARDs' kbd_queue lists.
  67    The flag kbd_queue_has_data in a KBOARD is 1 if this has happened.
  68    When Emacs goes back to the any-kboard state, it looks at all the KBOARDs
  69    to find those; and it tries processing their input right away.  */
  70
  71 typedef struct kboard KBOARD;
  72 struct kboard
  73   {
  74     KBOARD *next_kboard;
  75
  76     /* If non-nil, a keymap that overrides all others but applies only to
  77        this KBOARD.  Lisp code that uses this instead of calling read-char
  78        can effectively wait for input in the any-kboard state, and hence
  79        avoid blocking out the other KBOARDs.  See universal-argument in
  80        lisp/simple.el for an example.  */
  81     Lisp_Object INTERNAL_FIELD (Voverriding_terminal_local_map);
  82
  83     /* Last command executed by the editor command loop, not counting
  84        commands that set the prefix argument.  */
  85     Lisp_Object INTERNAL_FIELD (Vlast_command);
  86
  87     /* Normally same as last-command, but never modified by other commands.  */
  88     Lisp_Object INTERNAL_FIELD (Vreal_last_command);
  89
  90     /* User-supplied table to translate input characters through.  */
  91     Lisp_Object INTERNAL_FIELD (Vkeyboard_translate_table);
  92
  93     /* Last command that may be repeated by `repeat'.  */
  94     Lisp_Object INTERNAL_FIELD (Vlast_repeatable_command);
  95
  96     /* The prefix argument for the next command, in raw form.  */
  97     Lisp_Object INTERNAL_FIELD (Vprefix_arg);
  98
  99     /* Saved prefix argument for the last command, in raw form.  */
 100     Lisp_Object INTERNAL_FIELD (Vlast_prefix_arg);
 101
 102     /* Unread events specific to this kboard.  */
 103     Lisp_Object INTERNAL_FIELD (kbd_queue);
 104
 105     /* Non-nil while a kbd macro is being defined.  */
 106     Lisp_Object INTERNAL_FIELD (defining_kbd_macro);
 107
 108     /* The start of storage for the current keyboard macro.  */
 109     Lisp_Object *kbd_macro_buffer;
 110
 111     /* Where to store the next keystroke of the macro.  */
 112     Lisp_Object *kbd_macro_ptr;
 113
 114     /* The finalized section of the macro starts at kbd_macro_buffer and
 115        ends before this.  This is not the same as kbd_macro_ptr, because
 116        we advance this to kbd_macro_ptr when a key's command is complete.
 117        This way, the keystrokes for "end-kbd-macro" are not included in the
 118        macro.  This also allows us to throw away the events added to the
 119        macro by the last command: all the events between kbd_macro_end and
 120        kbd_macro_ptr belong to the last command; see
 121        cancel-kbd-macro-events.  */
 122     Lisp_Object *kbd_macro_end;
 123
 124     /* Allocated size of kbd_macro_buffer.  */
 125     ptrdiff_t kbd_macro_bufsize;
 126
 127     /* Last anonymous kbd macro defined.  */
 128     Lisp_Object INTERNAL_FIELD (Vlast_kbd_macro);
 129
 130     /* Alist of system-specific X windows key symbols.  */
 131     Lisp_Object INTERNAL_FIELD (Vsystem_key_alist);
 132
 133     /* Cache for modify_event_symbol.  */
 134     Lisp_Object INTERNAL_FIELD (system_key_syms);
 135
 136     /* The kind of display: x, w32, ...  */
 137     Lisp_Object INTERNAL_FIELD (Vwindow_system);
 138
 139     /* Keymap mapping keys to alternative preferred forms.
 140        See the DEFVAR for more documentation.  */
 141     Lisp_Object INTERNAL_FIELD (Vlocal_function_key_map);
 142
 143     /* Keymap mapping ASCII function key sequences onto their preferred
 144        forms.  Initialized by the terminal-specific lisp files.  See the
 145        DEFVAR for more documentation.  */
 146     Lisp_Object INTERNAL_FIELD (Vinput_decode_map);
 147
 148     /* Minibufferless frames on this display use this frame's minibuffer.  */
 149     Lisp_Object INTERNAL_FIELD (Vdefault_minibuffer_frame);
 150
 151     /* Number of displays using this KBOARD.  Normally 1, but can be
 152        larger when you have multiple screens on a single X display.  */
 153     int reference_count;
 154
 155     /* The text we're echoing in the modeline - partial key sequences,
 156        usually.  This is nil when not echoing.  */
 157     Lisp_Object INTERNAL_FIELD (echo_string);
 158
 159     /* This flag indicates that events were put into kbd_queue
 160        while Emacs was running for some other KBOARD.
 161        The flag means that, when Emacs goes into the any-kboard state again,
 162        it should check this KBOARD to see if there is a complete command
 163        waiting.
 164
 165        Note that the kbd_queue field can be non-nil even when
 166        kbd_queue_has_data is 0.  When we push back an incomplete
 167        command, then this flag is 0, meaning we don't want to try
 168        reading from this KBOARD again until more input arrives.  */
 169     char kbd_queue_has_data;
 170
 171     /* True means echo each character as typed.  */
 172     bool_bf immediate_echo : 1;
 173
 174     /* If we have echoed a prompt string specified by the user,
 175        this is its length in characters.  Otherwise this is -1.  */
 176     ptrdiff_t echo_after_prompt;
 177   };
 178
 179 INLINE void
 180 kset_default_minibuffer_frame (struct kboard *kb, Lisp_Object val)
 181 {
 182   kb->INTERNAL_FIELD (Vdefault_minibuffer_frame) = val;
 183 }
 184 INLINE void
 185 kset_defining_kbd_macro (struct kboard *kb, Lisp_Object val)
 186 {
 187   kb->INTERNAL_FIELD (defining_kbd_macro) = val;
 188 }
 189 INLINE void
 190 kset_input_decode_map (struct kboard *kb, Lisp_Object val)
 191 {
 192   kb->INTERNAL_FIELD (Vinput_decode_map) = val;
 193 }
 194 INLINE void
 195 kset_last_command (struct kboard *kb, Lisp_Object val)
 196 {
 197   kb->INTERNAL_FIELD (Vlast_command) = val;
 198 }
 199 INLINE void
 200 kset_last_kbd_macro (struct kboard *kb, Lisp_Object val)
 201 {
 202   kb->INTERNAL_FIELD (Vlast_kbd_macro) = val;
 203 }
 204 INLINE void
 205 kset_prefix_arg (struct kboard *kb, Lisp_Object val)
 206 {
 207   kb->INTERNAL_FIELD (Vprefix_arg) = val;
 208 }
 209 INLINE void
 210 kset_system_key_alist (struct kboard *kb, Lisp_Object val)
 211 {
 212   kb->INTERNAL_FIELD (Vsystem_key_alist) = val;
 213 }
 214 INLINE void
 215 kset_window_system (struct kboard *kb, Lisp_Object val)
 216 {
 217   kb->INTERNAL_FIELD (Vwindow_system) = val;
 218 }
 219
 220 /* Temporarily used before a frame has been opened. */
 221 extern KBOARD *initial_kboard;
 222
 223 /* In the single-kboard state, this is the kboard
 224    from which input is accepted.
 225
 226    In the any-kboard state, this is the kboard from which we are
 227    right now considering input.  We can consider input from another
 228    kboard, but doing so requires throwing to wrong_kboard_jmpbuf.  */
 229 extern KBOARD *current_kboard;
 230 \f
 231 /* Total number of times read_char has returned, modulo UINTMAX_MAX + 1.  */
 232 extern uintmax_t num_input_events;
 233
 234 /* Nonzero means polling for input is temporarily suppressed.  */
 235 extern int poll_suppress_count;
 236
 237 /* Vector holding the key sequence that invoked the current command.
 238    It is reused for each command, and it may be longer than the current
 239    sequence; this_command_key_count indicates how many elements
 240    actually mean something.  */
 241 extern Lisp_Object this_command_keys;
 242 extern ptrdiff_t this_command_key_count;
 243
 244 /* The frame in which the last input event occurred, or Qmacro if the
 245    last event came from a macro.  We use this to determine when to
 246    generate switch-frame events.  This may be cleared by functions
 247    like Fselect_frame, to make sure that a switch-frame event is
 248    generated by the next character.  */
 249 extern Lisp_Object internal_last_event_frame;
 250 \f
 251 /* This holds a Lisp vector that holds the properties of a single
 252    menu item while decoding it in parse_menu_item.
 253    Using a Lisp vector to hold this information while we decode it
 254    takes care of protecting all the data from GC.  */
 255 extern Lisp_Object item_properties;
 256
 257 /* This describes the elements of item_properties.
 258    The first element is not a property, it is a pointer to the item properties
 259    that is saved for GC protection. */
 260 #define ITEM_PROPERTY_ITEM 0
 261 /* The item string.  */
 262 #define ITEM_PROPERTY_NAME 1
 263 /* Start of initialize to nil */
 264 /* The binding: nil, a command or a keymap.  */
 265 #define ITEM_PROPERTY_DEF 2
 266 /* The keymap if the binding is a keymap, otherwise nil.  */
 267 #define ITEM_PROPERTY_MAP 3
 268 /* Nil, :radio or :toggle.  */
 269 #define ITEM_PROPERTY_TYPE 4
 270 /* Nil or a string describing an equivalent key binding.  */
 271 #define ITEM_PROPERTY_KEYEQ 5
 272 /* Not nil if a selected toggle box or radio button, otherwise nil.  */
 273 #define ITEM_PROPERTY_SELECTED 6
 274 /* Place for a help string. Not yet used.  */
 275 #define ITEM_PROPERTY_HELP 7
 276 /* Start of initialize to t */
 277 /* Last property. */
 278 /* Not nil if item is enabled.  */
 279 #define ITEM_PROPERTY_ENABLE 8
 280
 281 /* This holds a Lisp vector that holds the results of decoding
 282    the keymaps or alist-of-alists that specify a menu.
 283
 284    It describes the panes and items within the panes.
 285
 286    Each pane is described by 3 elements in the vector:
 287    t, the pane name, the pane's prefix key.
 288    Then follow the pane's items, with 5 elements per item:
 289    the item string, the enable flag, the item's value,
 290    the definition, and the equivalent keyboard key's description string.
 291
 292    In some cases, multiple levels of menus may be described.
 293    A single vector slot containing nil indicates the start of a submenu.
 294    A single vector slot containing lambda indicates the end of a submenu.
 295    The submenu follows a menu item which is the way to reach the submenu.
 296
 297    A single vector slot containing quote indicates that the
 298    following items should appear on the right of a dialog box.
 299
 300    Using a Lisp vector to hold this information while we decode it
 301    takes care of protecting all the data from GC.  */
 302 extern Lisp_Object menu_items;
 303
 304 /* If non-nil, means that the global vars defined here are already in use.
 305    Used to detect cases where we try to re-enter this non-reentrant code.  */
 306 extern Lisp_Object menu_items_inuse;
 307
 308 /* Number of slots currently allocated in menu_items.  */
 309 extern int menu_items_allocated;
 310
 311 /* This is the index in menu_items of the first empty slot.  */
 312 extern int menu_items_used;
 313
 314 /* The number of panes currently recorded in menu_items,
 315    excluding those within submenus.  */
 316 extern int menu_items_n_panes;
 317
 318 #define MENU_ITEMS_PANE_NAME 1
 319 #define MENU_ITEMS_PANE_PREFIX 2
 320 #define MENU_ITEMS_PANE_LENGTH 3
 321
 322 enum menu_item_idx
 323 {
 324   MENU_ITEMS_ITEM_NAME = 0,
 325   MENU_ITEMS_ITEM_ENABLE,
 326   MENU_ITEMS_ITEM_VALUE,
 327   MENU_ITEMS_ITEM_EQUIV_KEY,
 328   MENU_ITEMS_ITEM_DEFINITION,
 329   MENU_ITEMS_ITEM_TYPE,
 330   MENU_ITEMS_ITEM_SELECTED,
 331   MENU_ITEMS_ITEM_HELP,
 332   MENU_ITEMS_ITEM_LENGTH
 333 };
 334
 335 extern void unuse_menu_items (void);
 336
 337 /* This is how to deal with multibyte text if HAVE_MULTILINGUAL_MENU
 338    isn't defined.  The use of HAVE_MULTILINGUAL_MENU could probably be
 339    confined to an extended version of this with sections of code below
 340    using it unconditionally.  */
 341 #ifndef HAVE_NTGUI
 342 #if defined (USE_GTK) || defined (HAVE_NS)
 343 # define ENCODE_MENU_STRING(str) ENCODE_UTF_8 (str)
 344 #elif defined HAVE_X_I18N
 345 #define ENCODE_MENU_STRING(str) ENCODE_SYSTEM (str)
 346 #else
 347 #define ENCODE_MENU_STRING(str) string_make_unibyte (str)
 348 #endif /* USE_GTK  */
 349 #else /* HAVE_NTGUI */
 350 #define ENCODE_MENU_STRING(str) (str)
 351 #endif
 352
 353 /* Macros for dealing with lispy events.  */
 354
 355 /* True if EVENT has data fields describing it (i.e. a mouse click).  */
 356 #define EVENT_HAS_PARAMETERS(event) (CONSP (event))
 357
 358 /* Extract the head from an event.
 359    This works on composite and simple events.  */
 360 #define EVENT_HEAD(event) \
 361   (EVENT_HAS_PARAMETERS (event) ? XCAR (event) : (event))
 362
 363 /* Extract the starting and ending positions from a composite event.  */
 364 #define EVENT_START(event) (CAR_SAFE (CDR_SAFE (event)))
 365 #define EVENT_END(event) (CAR_SAFE (CDR_SAFE (CDR_SAFE (event))))
 366
 367 /* Extract the click count from a multi-click event.  */
 368 #define EVENT_CLICK_COUNT(event) (Fnth (make_number (2), (event)))
 369
 370 /* Extract the fields of a position.  */
 371 #define POSN_WINDOW(posn) (CAR_SAFE (posn))
 372 #define POSN_POSN(posn) (CAR_SAFE (CDR_SAFE (posn)))
 373 #define POSN_SET_POSN(posn,x) (XSETCAR (XCDR (posn), (x)))
 374 #define POSN_WINDOW_POSN(posn) (CAR_SAFE (CDR_SAFE (CDR_SAFE (posn))))
 375 #define POSN_TIMESTAMP(posn) (CAR_SAFE (CDR_SAFE (CDR_SAFE (CDR_SAFE (posn)))))
 376 #define POSN_SCROLLBAR_PART(posn)       (Fnth (make_number (4), (posn)))
 377
 378 /* A cons (STRING . STRING-CHARPOS), or nil in mouse-click events.
 379    It's a cons if the click is over a string in the mode line.  */
 380
 381 #define POSN_STRING(posn) (Fnth (make_number (4), (posn)))
 382
 383 /* If POSN_STRING is nil, event refers to buffer location.  */
 384
 385 #define POSN_INBUFFER_P(posn) (NILP (POSN_STRING (posn)))
 386 #define POSN_BUFFER_POSN(posn) (Fnth (make_number (5), (posn)))
 387
 388 /* Getting the kind of an event head.  */
 389 #define EVENT_HEAD_KIND(event_head) \
 390   (Fget ((event_head), Qevent_kind))
 391
 392 /* True while doing kbd input.  */
 393 extern bool waiting_for_input;
 394
 395 /* Address (if not 0) of struct timespec to zero out if a SIGIO interrupt
 396    happens.  */
 397 extern struct timespec *input_available_clear_time;
 398
 399 extern bool ignore_mouse_drag_p;
 400
 401 extern Lisp_Object parse_modifiers (Lisp_Object);
 402 extern Lisp_Object reorder_modifiers (Lisp_Object);
 403 extern Lisp_Object read_char (int, Lisp_Object, Lisp_Object,
 404                               bool *, struct timespec *);
 405 extern int parse_solitary_modifier (Lisp_Object symbol);
 406
 407
 408 /* This is like Vthis_command, except that commands never set it.  */
 409 extern Lisp_Object real_this_command;
 410
 411 extern int quit_char;
 412
 413 extern unsigned int timers_run;
 414
 415 extern bool menu_separator_name_p (const char *);
 416 extern bool parse_menu_item (Lisp_Object, int);
 417
 418 extern KBOARD *allocate_kboard (Lisp_Object);
 419 extern void delete_kboard (KBOARD *);
 420 extern void not_single_kboard_state (KBOARD *);
 421 extern void push_kboard (struct kboard *);
 422 extern void push_frame_kboard (struct frame *);
 423 extern void pop_kboard (void);
 424 extern void temporarily_switch_to_single_kboard (struct frame *);
 425 extern void record_asynch_buffer_change (void);
 426 extern void input_poll_signal (int);
 427 extern void start_polling (void);
 428 extern void stop_polling (void);
 429 extern void set_poll_suppress_count (int);
 430 extern int gobble_input (void);
 431 extern bool input_polling_used (void);
 432 extern void clear_input_pending (void);
 433 extern bool requeued_events_pending_p (void);
 434 extern void bind_polling_period (int);
 435 extern int make_ctrl_char (int) ATTRIBUTE_CONST;
 436 extern void stuff_buffered_input (Lisp_Object);
 437 extern void clear_waiting_for_input (void);
 438 extern void swallow_events (bool);
 439 extern bool lucid_event_type_list_p (Lisp_Object);
 440 extern void kbd_buffer_store_event (struct input_event *);
 441 extern void kbd_buffer_store_event_hold (struct input_event *,
 442                                          struct input_event *);
 443 extern void kbd_buffer_unget_event (struct input_event *);
 444 extern void poll_for_input_1 (void);
 445 extern void show_help_echo (Lisp_Object, Lisp_Object, Lisp_Object,
 446                             Lisp_Object);
 447 extern void gen_help_event (Lisp_Object, Lisp_Object, Lisp_Object,
 448                             Lisp_Object, ptrdiff_t);
 449 extern void kbd_buffer_store_help_event (Lisp_Object, Lisp_Object);
 450 extern Lisp_Object menu_item_eval_property (Lisp_Object);
 451 extern bool kbd_buffer_events_waiting (void);
 452 extern void add_user_signal (int, const char *);
 453
 454 extern int tty_read_avail_input (struct terminal *, struct input_event *);
 455 extern struct timespec timer_check (void);
 456 extern void mark_kboards (void);
 457
 458 #ifdef HAVE_NTGUI
 459 extern const char *const lispy_function_keys[];
 460 #endif
 461
 462 INLINE_HEADER_END